For the "PAM" is concerned, we all know that it is the main water treatment agent, especially in the wastewater treatment industry more widely used. Studies have shown that not only can be used polyacrylamide in industrial water, if good control of the dosage can also be applied in the field of food, raw water treatment. Molecular weight polyacrylamide vary, various sectors of polyacrylamide molecular weight requirements are not the same. First, industrial waste areas. For this field, on polyacrylamide relatively easy choice. Enterprises according to the degree of contamination of water quality to determine which content polyacrylamide use. Under normal circumstances are using anionic polyacrylamide, molecular weight by between 8 to 20 million, with the degree of contamination of sewage to select molecular weight polyacrylamide. Second, aspects of urban sewage. Because the water effluent is more complex, and therefore more complex when the selection polyacrylamide. Bringing together different sectors of sewage, to deal with a big problem. Thus, in terms of urban sewage treatment, try to choose an efficient polyacrylamide products, which can effectively guarantee the treatment effect. Finally, the drinking water. Because of polyacrylamide in the field of application of more stringent drinking water, generally choose "cationic polyacrylamide," and the product purity is higher than the standard industrial use of the product.